Looking at how U.S. policies on paid vacation compare to those of other developed nations, the difference is clear. That's because the U.S. is the only nation in the Organization for Economic Cooperation and Development that doesn't require businesses to offer any paid leave. It's up to employers to decide how many days off to allow their employees, and according to a report from the Center for Economic and Policy Research, many companies simply don't. In fact, more than 30 percent of U.S. small businesses don't offer their employees paid vacation at all.

The graphic below from statistics company Statista shows just how many vacation days some Americans are missing.